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If anyone has ever configured something like this, I'd be interested in any
notes or opinions you can provide about this kind of configuration, or
possibilities for entirely different setups which do the same thing.

I haven't done it personally, but you could try using LVM's snapshot
feature to create one or several disk images based on a single original
image whose changes would be stored in the snapshot storage. You'd want
to make sure you had enough room for the storage of all changes of course.